Underworld Breach + Diligent Excavator + Thassa's Oracle + Sakashima of a Thousand Faces

Underworld Breach

Diligent Excavator

Thassa's Oracle

Sakashima of a Thousand Faces

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Sakashima of a Thousand Faces trigger, causing you to mill four cards.
3. The artifact creature enters the battlefield and dies as a state-based action due to having zero toughness.
4. Cast the artifact creature from your graveyard for its escape cost by paying 0 and exiling any three cards from your graveyard, except Thassa's Oracle if it is in your graveyard.
5. Repeat from step 2 until you have an empty library.
6. If Thassa's Oracle is in your hand, cast it by paying .
7. Otherwise, cast Thassa's Oracle from your graveyard for its escape cost by paying and exiling three cards from your graveyard.
8. Thassa's Oracle enters the battlefield, causing you to win the game.

This ingenious loop leverages Underworld Breach to recast a zero-cost artifact creature from your graveyard over and over, feeding its escape cost by churning through the cards you send to the graveyard. Every time you cast that artifact creature—or any historic spell—Diligent Excavator triggers to feed your graveyard further, a process doubled because Sakashima of a Thousand Faces is copying it while also blanking the legend rule. Once your library is completely emptied by this relentless self-mill, you simply cast Thassa's Oracle—either from your hand or escaped via Underworld Breach—whose devotion check instantly translates your empty library into a glorious victory.